Temporary elevator

Abstract

To provide a temporary elevator that improves the safety of work involving the lifting of heavy objects and also contributes to reducing the labor and costs involved in the work. [Solution] The temporary elevator 1 is provided with an elevator base (support beam) 28 that rises and falls with movement in the forward / backward and left / right directions restricted, a lower platform 29 that can move left / right on the elevator base with movement in the forward / backward direction restricted, and an upper platform 30 that can move forward / backward on the lower platform 29 with movement in the left / right direction restricted.

Description

[Technical Field]

[0001] The present invention relates to a temporary elevator suitable for use in installing brackets for reinforcing bridges, for example. [Background technology]

[0002] Conventionally, as shown in Figures 22(A) and (B), bracket B has been installed at the corner where the underside of the bridge girder (superstructure) meets the side of the pier (substructure) to reinforce the bridge (pier) and prevent it from collapsing.

[0003] Specifically, as shown in Figure 22(A), an anchor bolt A for fixing a bracket B is buried in advance at a predetermined position on the top of the pier, and the bracket B is then lifted up to near that position, and the anchor bolt A is inserted into the bolt hole formed in the bracket B to attach the bracket B. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2024-63540 Summary of the Invention [Problem to be solved by the invention]

[0005] Bracket B is heavy (e.g., 300 kg), making it difficult to install in a relatively high (e.g., 2 m or higher) recessed corner. For example, lifting and moving Bracket B near the recessed corner using a crane is impossible because the crane would interfere with the bridge girder. Therefore, using aerial work platforms instead of a crane is an option, but the load capacity of a standard aerial work platform is at most 200 kg, which is insufficient to lift the heavy Bracket B and the worker who will install it. Furthermore, large aerial work platforms with ample load capacity are large and heavy, limiting their ability to enter construction sites. Furthermore, even if the issues of load capacity and access to the construction site could be overcome, installing Bracket B would require the partial removal of safety handrails around the work platform that would be lifted by the aerial work platform. This, combined with the heavy weight of Bracket B, increases the risk of installation work.

[0006] Patent Document 1 describes a method of installing brackets using a forklift, but this method requires scaffolding for workers to work on, and installing scaffolding with safety in mind requires a considerable amount of effort and cost. In particular, this method requires the scaffolding to be erected in a way that avoids the forklift's access path, and it is thought that installation is likely to require more effort and cost than usual.

[0007] The present invention has been made with the above-mentioned points in mind, and its purpose is to provide a temporary elevator that increases the safety of work involving lifting heavy objects while also helping to reduce the effort and cost involved in carrying out the work. [Means for solving the problem]

[0008] In order to achieve the above object, the temporary elevator according to the present invention comprises: This temporary elevator is installed in an area surrounded by an upright surface, an upward surface extending horizontally from the bottom of the upright surface, and a downward surface extending horizontally from the top of the upright surface. The elevator is guided by the four supports, and is configured to have a total of four support columns that can be assembled and disassembled and are provided at the front and back of each of the left and right sides so as to be stretched between the upward and downward surfaces. a lifting base that moves up and down while its movement in the front-back and left-right directions is restricted; A winch is arranged on the left and right outer sides of the four columns and raises and lowers the lifting base via a wire rope.It is equipped with a lower platform that can move left and right on a lifting base while its movement in the forward and backward directions is restricted, and an upper platform that can move forward and backward on the lower platform while its movement in the left and right directions is restricted (Claim 1).

[0009] In the temporary elevator, the upper platform is The upper stand body and the lower surface of the upper stand body are paired on the left and right sides, Rotates around the left and right axis while in contact with the lower stand death Anteroposterior direction the upper stage frame is provided with a plurality of pairs of wheels arranged in a line, a restraining device with a U-shape in vertical cross section provided at the center of the underside of the left and right parts of the upper stage frame body, an auxiliary wheel positioned rearward of all the pairs of wheels and lower than the plurality of pairs of wheels, a support frame that supports the auxiliary wheel, and a protruding plate fixed to the front of the restraining device and protruding forward, and the upper stage frame is movable in the front-to-rear direction with the plurality of pairs of wheels rolling on the upper surface of the lower stage frame and the auxiliary wheel rolling on the underside of the upper flange of the H-shaped steel that constitutes both the left and right parts of the lower stage frame, and all the plurality of pairs of wheels coming off the upper surface of the lower stage frame in the front and rear directions does not mean that the upper flange of the H-shaped steel that constitutes both the left and right parts of the lower stage frame will come off the lower flange. The lower part and protruding plate of the restraint device, which is inserted between the flanges from the outside in the left-right direction, come into contact with a plate-shaped stopper that extends outward in the left-right direction from between the upper flange and the lower flange of the H-shaped steel that constitutes the four corners of the lower frame, and of the multiple pairs of wheels, the first wheel (the foremost), the second wheel (the second from the front), and the third wheel (the third from the front) are located closer to the front end than the rear end of the upper frame, and the fourth wheel (the fourth from the front) is located closer to the rear end than the front end of the upper frame, and the front-to-rear distance between the third wheel and the fourth wheel is greater than the front-to-rear distance between the first wheel and the second wheel, and is also greater than the front-to-rear distance between the second wheel and the third wheel. This is also possible (Claim 2). [Effects of the Invention]

[0010] The present invention provides a temporary elevator that increases the safety of work involving the lifting of heavy objects while also contributing to reducing the effort and cost involved in carrying out the work.

[0011] In other words, with the temporary elevator of the invention according to each claim of this application, once a heavy object is set on the upper platform, it can be raised and lowered and moved back and forth and left and right, and work safety can be improved by having workers stay away from the temporary elevator from the start to the end of raising and lowering the heavy object. Also, if a worker is required to ride on the temporary elevator when raising or lowering a heavy object, the effort and cost of installing the temporary elevator to improve safety increases, but by eliminating the need for such a ride and having workers raise and lower the object using a separate aerial work vehicle or the like, the effort and cost involved in implementation can be reduced.

[0012] When a heavy object set on an upper platform is to be attached to a wall in front of the temporary elevator, the heavy object is moved forward. In this case, it is preferable to position the center of gravity of the heavy object toward the front of the upper platform. In the temporary elevator of the invention of claim 2, the wheels are arranged densely (in greater numbers) at the front of the upper platform, so that such an imbalance in the center of gravity can be accommodated and good load distribution can be achieved between the wheels at the front. [Brief explanation of the drawings]

[0013] [Figure 1] 1A and 1B are a front view and a side view of a temporary elevator according to an embodiment of the present invention. [Figure 2] 10(A) and 10(B) are a front view and a side view showing the construction status of the first step of the installation procedure of the temporary elevator. [Figure 3] 10(A) and 10(B) are a front view and a side view showing the construction status of the second step of the installation procedure for the temporary elevator. [Figure 4] 10(A) to 10(C) are a front view, a plan view, and a side view showing the construction status of the third step of the installation procedure for the temporary elevator. [Figure 5] 10(A) and 10(B) are a front view and a side view showing the construction status of a fourth step of the installation procedure for the temporary elevator. [Figure 6] 10(A) and 10(B) are front views showing the construction status during and after the fifth step of the installation procedure for the temporary elevator. [Figure 7] 10(A) and 10(B) are front views showing the construction status during and after the sixth step of the installation procedure for the temporary elevator. [Figure 8] (A) and (B) are side views showing an example and another example of the construction status during the seventh step of the installation procedure for the temporary elevator, and (C) is a front view showing the construction status after the seventh step is completed. [Figure 9] 10(A) and 10(B) are a front view and a plan view showing the construction status of an eighth step of the installation procedure for the temporary elevator. [Figure 10] 10A is a front view showing the construction status during the ninth step of the installation procedure for the temporary elevator, and FIG. 10B and FIG. 10C are a front view and a side view showing the construction status after the ninth step is completed. [Figure 11] 10(A) and 10(B) are side views showing the construction status during and after the tenth step of the installation procedure for the temporary elevator. [Figure 12] 1(A) to 1(C) are a plan view, a front view, and a side view of the supporting base material installed in the first step. [Figure 13] (A) to (D) are front views of four types of support elements that make up the support columns of the temporary elevator, (E) is an enlarged view of (D), (F) is a view from the arrow F of (D), and (G) is a cross-sectional end view of (D) along line G. [Figure 14]10(A) to 10(D) are a plan view, a front view, a side view, and a partially enlarged plan view of a lower support beam of the temporary elevator. [Figure 15] 4(A) to 4(C) are a plan view, a front view, and a side view of the horizontal connecting member for the suspension part of the temporary elevator. [Figure 16] 4(A) to 4(C) are a plan view, a front view, and a side view of an upper support beam of the temporary elevator. [Figure 17] (A) to (C) are plan views, front views and side views of the lower frame of the temporary elevator, (D) to (F) are plan views, front views and side views of the upper frame of the temporary elevator, and (G) is a front view of the frame of the temporary elevator. [Figure 18] (A) and (B) are plan and side views of the jack support beam of the temporary elevator, (C) to (E) are front, side and plan views of the pulley and pulley support, and (F) and (G) are front and bottom views of the jack. [Figure 19] 10(A) to 10(C) are plan views, front views and side views of the left and right fixed braces of the temporary elevator, and 10(D) to 10(F) are plan views, front views and side views of the front and rear fixed braces. [Figure 20] (A) to (C) are plan views, side views and front views of the outriggers of the temporary elevator, (D) is a front view of the snatch block, and (E) and (F) are side views and front views of the hoisting device. [Figure 21] (A) and (B) are side views showing the state of the upper stage 30 when the bracket B is set and when it is raised and lowered and when it is installed, and (C) and (D) are explanatory diagrams showing the difference between when there is a protruding plate and when there is not. [Figure 22] (A) and (B) are explanatory diagrams showing the process of attaching the bracket to the top of the pier. DETAILED DESCRIPTION OF THE INVENTION

[0014] An embodiment of the present invention will be described below.

[0015] 1(A) and (B) show a temporary elevator 1 of this example. This temporary elevator 1 is installed in an area surrounded by an upright surface S1, an upward surface S2 extending horizontally from the lower end of this upright surface S1, and a downward surface S3 extending horizontally from the upper end of the upright surface S3, and is of the type that is hoisted up by a winch. Below, the installation procedure (steps 1 to 11) of this temporary elevator 1 will be explained, along with a detailed explanation of the configuration of this temporary elevator 1.

[0016] In the following, we will explain an example in which a temporary elevator 1 is installed in an area surrounded by an upright surface S1, which is the side of the bridge pier, an upward surface S2, which is the ground, and a downward surface S3, which is the underside of the bridge girder, and the temporary elevator 1 is used to attach a bracket B (an example of a heavy object; see Figure 22) for bridge reinforcement to the corner where the upright surface S1 and the downward surface S3 intersect.

[0017] Unless otherwise specified, the direction approaching the standing surface S1 will be referred to as the front, the opposite direction as the back, the side to the left of the standing surface S1 as the left, and the side to the right as the right, as shown in Figures 1(A) and (B).

[0018] <Step 1: Installing the supporting foundation> 2(A) and (B), two support base members 2 are installed horizontally on the upward surface S2 of the area where the temporary elevator 1 is to be installed, with their longitudinal directions facing left and right. At this time, in order to avoid interference with the anchor bolts A (see Figure 22) for fixing the brackets B that are embedded in advance in the upper part of the upright surface S1, the front support base member 2 is positioned a predetermined distance d (for example, about 300 mm) from the upright surface S1.

[0019] As shown in Figures 12(A) to 12(C), the two support base members 2 are made of H-shaped steel and are connected (joined) by a connecting member 3 made of H-shaped steel that is shorter than the support base members 2. This connection can be performed by welding, for example.

[0020] Specifically, both ends and the center in the longitudinal direction of each of the two support foundation materials 2 are connected to each other by connecting materials 3. In addition, pillar base parts 4 are set at positions a certain distance from both ends of the longitudinal direction of each support foundation material 2 toward the center (positions closer to the ends than the center), and the pillar base parts 4 of the two support foundation materials 2 are also connected to each other by connecting materials 3.

[0021] A roughly square plate-shaped connecting flange 5 (not shown in Figure 12(C)) is connected to the outside of each pillar base 4 by, for example, welding, and the thickness of the connecting flange 5 is approximately the same as that of the flanges that make up the support base material 2. Also, a connecting web 6 that continues to the web of the tie material 3 connected to the inside of each pillar base 4 is connected to the inside of each pillar base 4 by, for example, welding. The pillar base 4 provided with such connecting flanges 5 and connecting web 6 has greater strength than other parts.

[0022] <Second step: Connecting the first stage of the support and installing the winch> As shown in Figures 3(A) and (B), a support element 8 constituting the first stage of the support 7 (see Figures 1(A) and (B)) is connected to each of the four support base sections 4 (see also Figure 12(A)) set on the two support base materials 2, and winches 9 are installed on the left and right outer sides of the support base sections 4 on each of the two support base materials 2.

[0023] The support elements 8 that make up the support 7 come in multiple types with different lengths, specifically four types of support elements 8A to 8D as shown in Figures 13(A) to 13(D). 8A is twice as long as 8B, 8B is twice as long as 8C, and 8C is twice as long as 8D, and the length of 8D is, for example, 250 mm.

[0024] 13(G), a support element 8D shown enlarged in Fig. 13(E) has an element body 12 configured by arranging four support members 10 made of L-angles at the four corners and connecting adjacent support members 10 with rectangular plate-shaped support connectors 11. That is, the element body 12 is made by connecting a total of four support members 10 and a total of four support connectors 11 so that its cross-sectional shape resembles the outline of a square (e.g., one side is 250 mm), and the overall shape is a roughly rectangular tube with holes. The support members 10 and the support connectors 11 are joined by, for example, welding. The column connecting material 11 has a plurality of openings 11a (three in the illustrated example) that pass through the center in the short direction and are equally spaced along its length, and the column member 10 has openings 10a that are positioned on the line where the openings 11a are lined up and are aligned at equal intervals with the plurality of openings 11a (one on each side of the column connecting material 11 in the illustrated example). Here, Figure 13(E) shows a front view of the column element 8D, but the left and right side views and back view of the column element 8D are also the same.

[0025] As shown in Fig. 13(E), square plate-shaped connecting flange plates 13 are joined, for example by welding, to both ends in the axial direction (vertical direction) of the approximately rectangular cylindrical element body 12. As shown in Fig. 13(F), the connecting flange plate 13 has one large opening 13a in the center and multiple (16 in total in the illustrated example) small openings 13b at equal intervals along the periphery. Here, Fig. 13(F) shows a plan view of the strut element 8D, and the bottom view of the strut element 8D is the same.

[0026] 13(E) to (G) have been used to explain the strut element 8D, but the other strut elements 8A to 8C differ from strut element 8D only in the length of the element body 12 (the length of each strut member 10 constituting the element body 12, the number of strut connectors 11, and the number of openings 10a provided in accordance with the positions of the strut connectors 11), and therefore explanations thereof will be omitted. When providing a plurality of strut connectors 11 in the axial direction as in the strut elements 8A to 8C shown in Figures 13(A) to (C), it is preferable to provide these at equal intervals in the axial direction.

[0027] 1(B), the support column 7 is provided so as to brace between the upward surface S2 and the downward surface S3, and the distance from the upward surface S2 to the downward surface S3 varies depending on the construction site, so the support column elements 8A to 8D can be combined appropriately to form a support column 7 with a height according to that distance. In other words, any type of support column element 8 can be selected from the support column elements 8A to 8D, and a single support column element 8 can be used as the support column 7 as is, or a plurality of support column elements 8 can be stacked (combined) in multiple layers to form the support column 7.

[0028] In this example, as shown in Figures 3(A) and (B), the column element 8B is used in the first stage of the column 7, and the column element 8B (column element 8) can be connected to the column base 4 by bolting. That is, as shown in Figure 12(A), the column base 4 has a plurality of openings 4a at positions corresponding to a plurality of small openings 13b in the connecting flange plate 13, and the column element 8B can be connected to the column base 4 by tightening the bolts and nuts inserted through both openings 4a and 13b. It goes without saying that such connection is not limited to the column element 8B, but can also be made in the same way with the other column elements 8A, 8C, and 8D.

[0029] On the other hand, the installation of the winch 9 can be carried out, for example, by fixing a winch stand 14 spanning the two front and rear support base members 2 on each of the two support base members 2 on the left and right outer sides of the support column base portions 4, as shown in Figure 3(A), and then fixing the winch 9 on top of the winch stand 14.

[0030] <Third step: Connect the horizontal tie member to the lower support beam> As shown in Figures 4(A) to 4(C), the hanging section horizontal tie material 16 is connected to the upper side of the lower support beam 15. Note that this third step and the fourth step described below can be performed in a location separate from the first and second steps, and they do not necessarily have to be performed after the first and second steps, but may be performed before them or at the same time (in parallel).

[0031] As shown in Figures 14(A) to 14(C), the lower support beams 15 are arranged so that their longitudinal directions face left and right, and two lower support beams 15 are lined up front and back with a gap between them. Each lower support beam 15 has a lower support beam body 17 made of H-shaped steel, and horizontal displacement restraint devices 18 provided on both longitudinal sides of one end of the lower support beam body 17 in the shorter direction. The front lower support beam 15 has a horizontal displacement restraint device 18 on its front side, and the rear lower support beam 15 has a horizontal displacement restraint device 18 on its rear side.

[0032] The upper flange 17a of the lower support beam body 17 has a plurality of through holes 17b for connecting the hanging section horizontal ties 16. In the example of Figure 14(A), the through holes 17b are arranged in a matrix of 2 columns x 4 rows in four areas: two areas located on both ends of the upper flange 17a in the longitudinal direction, and two areas located away from these two areas toward the center in the longitudinal direction and closer to the center than the ends.

[0033] As shown in Figures 14(B) and (D), the horizontal displacement restraint device 18 comprises a plate-shaped base body 19 that is joined (fixed) by, for example, welding across the upper flange 17a and lower flange 17c of the lower support beam main body 17 (or to either flange 17a or 17b), a first wheel support 21 that is connected to one side of the base body 19 and holds a first wheel 20 that rotates around an axis in the fore-and-aft direction in a state where it protrudes outward in the left-right direction from the lower support beam main body 17, and a second wheel support 23 that is connected to the other side of the base body 19 and holds a second wheel 22 that rotates around an axis in the left-right direction in a state where it protrudes outward in the left-right direction from the lower support beam main body 17, and the first wheel 20 and the second wheel 22 are arranged so as to form an inside corner when viewed in a plan view.

[0034] As shown in Figures 15(A) to (C), the hanging section horizontal connecting members 16 are connected to the upper side of the lower support beam 15 with their longitudinal directions facing front to back and the four hanging section horizontal connecting members 16 lined up with gaps between them on the left and right.

[0035] Of the four horizontal hanging section ties 16, the two inner horizontal hanging section ties 16A are each made up of a single H-shaped steel beam, while the two outer horizontal hanging section ties 16B are made up of two H-shaped steel beams connected together, each half the length of the horizontal hanging section ties 16A, with connecting plates 24 attached to the connecting parts, and the connecting plates 24 are joined together by bolting (in this case, it is sufficient to provide openings in the connecting plates 24 for passing the bolts through) or welding, etc.

[0036] Furthermore, a through hole not shown in the figure is provided in the lower flange of each hanging section horizontal tie member 16, and the four hanging section horizontal tie members 16 are attached to the lower support beam 15 by tightening a nut onto a bolt that passes through this through hole and the through hole 17b of the lower support beam 15, as shown in Figures 4(A) and (B).

[0037] <Fourth step: Connect the horizontal tie member for the hanging section and the upper support beam> As shown in FIGS. 5(A) and 5(B), the upper support beam 25 is connected to the upper side of the hanging portion horizontal tie member 16.

[0038] 16(A) to 16(C), the longitudinal direction of the upper support beams 25 faces left and right, and two upper support beams 25 are arranged side by side in the front-to-rear direction with a gap between them. Each upper support beam 25 is made of H-shaped steel, and plate-shaped stoppers 26 are provided on the sides that face away from each other (outside in the front-to-rear direction) of the two front and rear upper support beams 25. That is, the front upper support beam 25 has two stoppers 26 on its front side, and the rear upper support beam 25 has two stoppers 26 on its rear side, and the two stoppers 26 are located at positions closer to both ends than to the center in the longitudinal direction of the upper support beams 25.

[0039] The two upper support beams 25 are connected by a plurality (15 in the illustrated example) of upper support beam horizontal tie members 27, whose longitudinal directions face forward and backward. The upper support beam horizontal tie members 27 are made of H-shaped steel beams that are the same height and width as the H-shaped steel beams that make up the upper support beams 25 but shorter in length, and the upper support beams 25 and the upper support beam horizontal tie members 27 are joined by welding, for example.

[0040] In addition, a plurality of holes 25a are provided at intervals in the longitudinal direction on the front side of the upper flange of the front upper support beam 25 and on the rear side of the upper flange of the rear upper support beam 25, and a plurality of holes 27a are provided at intervals in the longitudinal direction on the left and right sides of the upper flange of each upper support beam horizontal connecting member 27.

[0041] The lower flanges of the upper support beam 25 and the upper support beam horizontal tie member 27 have through holes not shown in the figure, and the upper support beam 25 and the upper support beam horizontal tie member 27 are attached to the hanging portion horizontal tie member 16 as shown in Figures 5(A) and (B) by tightening nuts onto bolts that pass through these through holes and through holes 16a (see Figure 15(A)) provided in the upper flange of the hanging portion horizontal tie member 16.

[0042] Here, the relative positions of the lower support beams 15, the hanging section horizontal tie members 16, and the upper support beams 25 are as follows: for the two front and rear lower support beams 15 shown in FIG. 14(A), the distance from the front end of the lower support beam body 17 of the front lower support beam 15 to the rear end of the lower support beam body 17 of the rear lower support beam 15; the length in the front-to-rear direction of each hanging section horizontal tie member 16 shown in FIG. 15(A); and for the two front and rear upper support beams 25 shown in FIG. 16(A), the distance from the front end of the front upper support beam 25 to the rear The distance to the rear end of the upper support beam 25 on the bottom side is the same (e.g., 1000 mm), and the left-right length of the lower support beam body 17 of the lower support beam 15 shown in Figure 14(A), the distance from the left end of the leftmost hanging section horizontal tie member 16 to the right end of the rightmost hanging section horizontal tie member 16 for a total of four hanging section horizontal tie members 16 shown in Figure 15(A), and the left-right length of the upper support beam 25 shown in Figure 16(A) are the same (e.g., 2930 mm).

[0043] In the fourth step carried out in this manner, a support beam 28 (an example of a lifting base) is formed by integrating the lower support beam 15, the hanging section horizontal tie member 16, the upper support beam 25 and the upper support beam horizontal tie member 27.

[0044] <5th step: Installation of support beams> In the second step, a support beam 28 is inserted from above and installed between the four support elements 8 that make up the first stage of the support column 7 connected to the support base material 2 (support column base portion 4), as shown in Figures 6(A) and (B).

[0045] This installation is performed so that the inside corner formed by the wheels 20, 22 of the horizontal displacement restraint device 18 provided on the lower support beam 15 corresponds to the outside corner formed by the corner of the support element 8 (support 7), as shown in Figure 14 (D).

[0046] <Sixth step: Setting up the stand> As shown in Figures 7(A) and (B), a lower platform 29 is attached to the upper side of the support beam 28 installed in the fifth step, and an upper platform 30 is further attached to the upper side of the lower platform 29, thereby completing the installation of the platform 31 consisting of the lower platform 29 which can move left and right and the upper platform 30 which can move back and forth.

[0047] 17(A) to 17(C), the lower gantry 29 includes a lower gantry main body 32 formed by assembling four H-shaped steel beams in a frame shape, wheels 33 that rotate around axes in the front-to-rear direction and are provided on the underside of the four corners of the lower gantry main body 32, and restraining devices 34 that are U-shaped in vertical cross section and are provided on the underside of the front center and rear center of the lower gantry main body 32. In addition, plate-shaped stoppers 35 that extend outward in the left-to-right direction are provided on the four corners of the lower gantry main body 32.

[0048] The front-to-rear length of the lower stage frame main body 32 shown in Figure 17(A) is the same as the distance from the front end of the front upper support beam 25 to the rear end of the rear upper support beam 25 for the two front and rear upper support beams 25 shown in Figure 16(A) (e.g., 1000 mm), and the left-to-right length of the lower stage frame main body 32 is approximately 1 / 4 to 1 / 2 (e.g., 800 mm) of the left-to-right length of the upper support beam 25 shown in Figure 16(A) (e.g., 2930 mm), and is approximately 1 / 3 to 2 / 5 (e.g., 800 mm) of the distance between the two stoppers 26 of the upper support beam 25 (e.g., 2200 mm).

[0049] To attach the lower platform 29 configured as described above to the upper side of the support beam 28, the lower platform 29, with the restraining devices 34 removed, is placed between the two stoppers 26 (see FIGS. 16A and 16B) of the upper support beam 25 of the support beam 28, and the restraining devices 34 are fixed to the lower platform 29 in this state by, for example, bolting. The lower platform 29 attached in this manner is movable in the left-right direction with the wheels 33 rolling on the upper surface of the upper support beam 25. The wheels 33 are prevented from coming off the top surface of the upper support beam 25 to the front or rear by the two front and rear restraining devices 34 abutting against the two front and rear upper support beams 25 from the outside in the front-to-rear direction. The wheels 33 are also prevented from coming off the top surface of the upper support beam 25 to the left or right by the lower parts of the restraining devices 34, which are inserted between the upper and lower flanges of the upper support beam 25 from the outside in the front-to-rear direction, abutting against the stoppers 26 of the upper support beam 25.

[0050] 17(D) to (F), the upper gantry 30 includes an upper gantry main body 36 formed by arranging six H-shaped steel beams in an "eye" shape, multiple pairs of wheels 37 arranged in the front-to-rear direction on both the left and right sides of the underside of the upper gantry main body 36, which form pairs of wheels 37 on the left and right sides of the underside of the upper gantry main body 36 and rotate around axes in the left-to-right direction, restraining devices 38 with a U-shaped vertical cross section provided in the center of the underside of the left and right parts of the upper gantry main body 36, auxiliary wheels 39 located lower than the wheels 37 at a position closer to the rear than the center of the underside of the left and right parts of the upper gantry main body 36 (a position rearward of all the wheels 37), and a support frame 40 that supports the auxiliary wheels 39. In addition, a protruding plate 41 that protrudes forward is fixed to the front of the restraining device 38 by welding or the like.

[0051] The lengths in the front-rear and left-right directions of the upper gantry body 36 shown in FIG. 17(D) are the same as the lengths in the front-rear and left-right directions of the lower gantry body 32 shown in FIG. 17(A).

[0052] To attach the upper gantry 30 having such a configuration to the upper side of the lower gantry 29, the upper gantry 30, with the restraints 38 and support frame 40 removed, is placed on the upper side of the lower gantry 29, and the restraints 38 and the support frame 40 supporting the auxiliary wheels 39 are then fixed to the upper gantry 30 in this state by, for example, bolting. The upper gantry 30 attached in this manner is movable in the front-to-rear direction with the wheels 37 rolling on the upper surface of the lower gantry 29 (lower gantry main body 32) and the auxiliary wheels 39 rolling on the lower surfaces of the upper flanges of the H-shaped steel beams that form both the left and right portions of the lower gantry main body 32 (see FIG. 17(G)). The wheels 37 are prevented from coming off the upper surface of the lower gantry 29 to the left or right by the two left and right restraints 38 abutting against the lower gantry 29 from the outside in the left and right directions. In addition, all of the wheels 37 are prevented from coming off the top surface of the lower platform 29 in the front and rear directions by the contact between the lower part of the restraint device 38 and the protruding plate 41, which are inserted from the outside in the left-right direction between the upper and lower flanges of the H-shaped steel that constitutes the left and right parts of the lower platform 29, and the stopper 35 of the lower platform 29.

[0053] <7th step: Connecting the brace to the support element> For the support elements 8 constituting the second or higher tier of the support 7 (see Figures 1(A) and (B)), as shown in Figures 8(A) and (B), the support elements 8 arranged spaced apart (side by side) in the front and back are connected and fixed with front and back fixing braces 42 (see Figures 19(D) to (F)) to form a one-sided connecting body 43, and as shown in Figure 8(C), the one-sided connecting bodies 43 arranged spaced apart (side by side) in the left and right are connected and fixed with left and right fixing braces 44 (see Figures 19(A) to (C)) to form a two-sided connecting body 45.

[0054] More specifically, in the example of Fig. 8(B), the upper and lower parts of two support elements 8A are connected and fixed together by front and rear fixing braces 42. In contrast to this, in the example of Fig. 8(A), a support element 8B is used instead of the support element 8A, and two support elements 8B are connected to form a support element 8 of a length equivalent to that of one support element 8A, and the upper support elements 8B and the lower support elements 8B are connected and fixed together by front and rear fixing braces 42.

[0055] Here, the support elements 8 can be connected to each other by fastening the connecting flange plates 13 located at both ends of each support element 8 together, for example, with bolts.

[0056] When two one-plane connecting bodies 43 are connected and fixed by the left and right fixing braces 44, the support elements 8 on the front side of the one-plane connecting bodies 43 may be connected and fixed together, or the support elements 8 on the rear side may be connected and fixed together, or both may be connected and fixed together. In this example, only the lower parts of the support elements 8 on the rear side are connected and fixed together by the left and right fixing braces 44.

[0057] In addition, the one-sided connecting body 43 may be constructed from support elements 8 connected and fixed by left and right fixed braces 44 rather than by front and rear fixed braces 42, and in this case, a two-sided connecting body 45 is obtained by connecting and fixing the one-sided connecting body 43 and the other support elements 8 by the front and rear fixed braces 42.

[0058] 8(A) uses a support element 8B, and in the example of Fig. 8(B) uses a support element 8A, but this is not limiting and other support elements 8 may be used. Also, in the examples of Fig. 8(A) to (C), the height dimensions of the front and rear fixed braces 42 and the left and right fixed braces 44 are set to a size corresponding to one support element 8B, but this is not limiting and the dimensions may be made larger or smaller.

[0059] <8th process: Assembling the assembly> As shown in Figs. 9(A) and (B), jacks 47 (see Figs. 18(F) and (G)) are connected and fixed to the upper surface of each of the front and rear jack support beams 46 (see Figs. 18(A) and (B)) made of two H-shaped steel beams arranged apart on the left and right, in a state of spanning the two left and right jack support beams 46, and four support column elements 8D are connected to the lower surface of each of the front and rear jack support beams 46 (for example, at four positions where the two jack support beams 46 extending in the front-rear direction and the two jacks 47 extending in the left-right direction intersect). are connected and fixed together, and two pulleys 48 (see Figures 18(C) to (E)) are provided at the upper center of the front-to-rear direction of the two left and right jack support beams 46, positioned so as to protrude outward in the left-to-right direction from the two left and right jack support beams 46 and supported by pulley supports 49 so as to rotate around an axis in the front-to-rear direction, and a hanging piece 49 (see Figures 18(H) and (I)) is provided at the lower center of the front-to-rear direction of the two left and right jack support beams 46, for example, so as to span the two left and right jack support beams 46, thereby completing an assembly 51 to be installed at the top of the support column 7.

[0060] <9th process: Assembly of support columns> As shown in Figures 10(A) to (C), the one-sided connector 43 formed in the seventh step, the two-sided connector 45, and the assembly 51 formed in the eighth step are connected in this order to the four support elements 8B of the first row of the support 7, thereby completing the support 7.

[0061] The work of connecting the one-plane connecting body 43, the two-plane connecting body 45, and the assembly 51 can be performed using, for example, a high-altitude work vehicle. At this time, the height of the jack 47 is adjusted so that the support 7 located between the upward surface S2 and the downward surface S3 is tensioned.

[0062] <10th step: Installing outriggers> As shown in FIGS. 11(A) and (B), the outriggers 52 are installed behind the left and right support bases 4 (see FIGS. 3(A) and (B)).

[0063] 20(A) to 20(C), the outrigger 52 is formed by connecting a support element 8 (support element 8B in the illustrated example) to the upper side of both ends of an outrigger base member 53 made of H-shaped steel, and then connecting and fixing the support elements 8 to each other with front and rear fixing braces 42. The outrigger 52 can be installed by joining, by bolting or the like, a connecting plate 53a provided in front of the outrigger base member 53 to a connecting plate (not shown) provided in a position on the support base member 2 facing the rear of the support base portion 4 (toward the outrigger 52).

[0064] <11th step: Wire rope installation> As shown in Figure 1(A), the wire rope 54 extending from the left and right winches 9 is hooked onto two pulleys 48 above the support 7, then extended downward, and the tip of the wire rope 54 is extended upward from the lower end so as to be folded back, and connected and fixed to the hanging piece 50. Meanwhile, a snatch block 55 (see Figure 20(D)) is provided at the folded back part, and the snatch block 55 is hooked to a hanging device 56 (see Figures 20(E) and (F)) fixed to an appropriate location in the center of the front-to-rear direction on both the left and right ends of the support beam 28, and the wire rope 54 is installed, thereby completing the installation of the temporary elevator 1.

[0065] To lift bracket B using the temporary elevator 1 configured as described above and attach it to an anchor bolt (not shown) buried in the upper part of the rising surface S1, the support beam 28 is lowered to the lowest position as shown in FIG. 1(A), bracket B is set on the platform 31 (upper platform 30) in this state, the left and right winches 9 are driven to wind up the left and right wire ropes 54, and the support beam 28 is raised to a predetermined height, after which the lower platform 29 of the platform 31 is moved left and right to adjust so that bracket B is in front of the anchor bolt, the upper platform 30 is moved forward to approach the anchor bolt, the anchor bolt is passed through the bolt hole formed in bracket B, and a nut is tightened onto the anchor bolt.

[0066] As described above, in the temporary elevator 1 of this example, which is equipped with the support beam 28 (elevating base) that rises and falls while its movement in the front-to-back and left-to-right directions is restricted, the lower platform 29 that can move left and right on the support beam 28 while its movement in the front-to-back direction is restricted, and the upper platform 30 that can move front and back on the lower platform 29 while its movement in the left and right direction is restricted, once the bracket B is set on the upper platform 30, it becomes possible to raise and lower it and move it forward, backward, left and right, and the safety of the work can be improved by having the worker stay away from the temporary elevator 1 from the start to the completion of raising and lowering the bracket B. Furthermore, if a worker is required to ride on the temporary elevator 1 when raising and lowering the bracket B, the effort and cost associated with installing the temporary elevator 1 increases in order to improve safety; however, by eliminating the need for a worker to ride on the temporary elevator 1 and having the worker raise and lower it using a separate aerial work vehicle or the like, the effort and cost associated with the implementation can be reduced.

[0067] 17(F), the upper platform 30 has a plurality of wheels 37 spaced apart in the front-to-rear direction, which rotate about a left-to-right axis while in contact with the lower platform 29, and the wheels 37 are arranged so that the average value of the front-to-rear spacing is smaller at the front side of the upper platform 30 than at the rear side. When attaching the bracket B set on the upper platform 30 to the standing surface S1 in front of the temporary lift 1, the bracket B is moved forward, and in this case, it is preferable to position the center of gravity of the bracket B closer to the front of the upper platform 30 (see FIGS. 21(A) and (B)). In the temporary lift 1 of this example, the wheels 37 are arranged so that they are densely packed (more in number) at the front side of the upper platform 30, as shown in FIG. 17(F), so that it is possible to accommodate such an imbalance in the center of gravity and to achieve good load distribution between the wheels 37 on the front side.

[0068] Furthermore, as described above, the restraining device 38 of the upper stage 30 is provided with the protruding plate 41. If this protruding plate 41 were not provided, the upper stage 30 would be able to advance to a position where the restraining device 38 abuts against the front stopper 35, as shown in FIG. 21(D), and all of the wheels 37 in front of the restraining device 38 may come off the ground. However, in this example where the protruding plate 41 is provided, the upper stage 30 can move forward to a position where the restraining device 38 abuts against the front stopper 35, as shown in FIG. (C)As shown in FIG. 1, the abutment of the protruding plate 41 with the front stopper 35 prevents the third wheel 37 from coming off, thereby improving the stability of the movement of the upper platform 30.

[0069] It should be noted that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the following modifications can be mentioned.

[0070] The order of steps 1 to 10 is merely an example, and this order can be changed as appropriate as long as it does not cause any problems. For example, steps 7 and 8 can be performed independently of steps 1 to 6, and may be performed in parallel with or before steps 1 to 6. Furthermore, step 10 may be performed at any timing between after step 2 and partway through step 9.

[0071] It goes without saying that the modifications given in this specification may be combined as appropriate. [Explanation of symbols]

[0072] 1 Temporary elevator 2 Supporting foundation material 3. Tie material 4 Pillar foundation 4a aperture 5 Connecting flange 6 Connected Web 7 pillars 8 strut elements (8A~8D) 9. Winch 10 Support member 10a opening 11 Support ties 11a opening 12 Element Body 13 Connecting flange plate 13a large opening 13b Small opening 14 Winch stand 15 Lower support beam 16 Hanging section horizontal connecting material (16A, 16B) 16a Through hole 17 Lower support beam body 17a Upper flange 17b Through hole 17c Lower flange 18 Horizontal displacement restraint device 19 Base body 20 1st wheel 21 First wheel support 22 2nd wheel 23 Second wheel support 24 connecting plate 25 Upper support beam 26 Stopper 27 Upper beam horizontal tie 28 Beam support 29 Lower stand 30 Upper stand 31 Mounting stand 32 Lower stand body 33 wheels 34 Restraints 35 Stopper 36 Upper stand body 37 wheels 38 Restraints 39 Auxiliary wheels 40 Support Frame 41 Protruding plate 42 Front and rear fixed brace 43 One-sided connector 44 Fixed left and right braces 45 Dihedral connection 46 Jack support beam 47 Jack 48 Pulley 49 Pulley support 50 Hanging Pieces 51 Assembly 52 Outrigger 53 Outrigger base material 54 Wire Rope 55 Snatch Block 56 Hanging equipment Anchor bolt B Bracket S1 standing surface S2 upward surface S3 downward surface

Claims

1. A temporary elevator that is installed and used in an area surrounded by an upright surface, an upward surface that extends horizontally from the lower end of the upright surface, and a downward surface that extends horizontally from the upper end of the upright surface, There are four support pillars that can be assembled and disassembled, which are installed at the front and back of both the left and right sides so that they are stretched between the upward and downward surfaces, a lifting base that is guided by four columns and moves up and down while its movement in the front-back and left-right directions is restricted; winches arranged on the left and right outer sides of the four columns and which raise and lower the lifting base via wire ropes; a lower platform that can move left and right on a lifting base while being restricted in its forward and backward movement; The temporary elevator is provided with an upper stage platform that can move forward and backward on the lower stage platform while its movement in the left and right directions is restricted.

2. The upper stage platform comprises an upper stage platform body, multiple pairs of wheels arranged in the front-to-rear direction and arranged in pairs on both the left and right sides of the underside of the upper stage platform body, rotating around left-to-right axes while in contact with the lower stage platform, restraint devices with a U-shaped longitudinal section provided at the center of the underside of the left and right parts of the upper stage platform body, auxiliary wheels positioned rearward of all the multiple pairs of wheels and lower than the multiple pairs of wheels, a support frame supporting the auxiliary wheels, and a protruding plate fixed to the front of the restraint device and protruding forward, The upper stage stand is movable in the front-to-rear direction with multiple pairs of wheels rolling on the upper surface of the lower stage stand, and the auxiliary wheels rolling on the undersides of the upper flanges of the H-shaped steel that constitute both the left and right parts of the lower stage stand, All of the pairs of wheels are prevented from coming off the top surface of the lower platform in the front and rear directions by the contact between the lower part and protruding plate of the restraint device, which is inserted from the outside in the left-right direction between the upper and lower flanges of the H-shaped steel that constitutes the left and right parts of the lower platform, and the plate-shaped stoppers that extend outward in the left-right direction from between the upper and lower flanges of the H-shaped steel that constitutes the four corners of the lower platform. A temporary elevator as described in claim 1, wherein, of the multiple pairs of wheels, the first wheel (front), the second wheel (second from the front), and the third wheel (third from the front) are positioned closer to the front end of the upper platform than the rear end, and the fourth wheel (fourth from the front) is positioned closer to the rear end of the upper platform than the front end, and the front-to-rear distance between the third wheel and the fourth wheel is greater than the front-to-rear distance between the first wheel and the second wheel and is also greater than the front-to-rear distance between the second wheel and the third wheel.

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